Self-closing valve for pneumatic hoisting-cylinders.



Patented Aug. 22, I899. 7

J. L. PARKER. SELF CLOSING VALVE FOR PNEUMATIC HOISTING CYLINDERS.

(knulication flled June 17, 1897.)

(No Model.)

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UNITED STATES PATENT OFFICE.

JAMES L. PARKER, OF CLEVELAND, OHIO.

SELF-CLOSING VALVE FOR PNEUMATIC HOlSTlNG-CYLINDERS.

SPECIFICATION forming part of Letters Patent No. 631,530, dated August22, 1899.

Application filed June 17,1897. Serial No. 641,208. (No model.)

To all whom it may concern:

Be it known that I, JAMES L. PARKER, a citizen of the United States,residing at Cleveland, in the countyof Ouyahoga and State of Ohio,having invented a new and useful Self- Closing Valve for PneumaticHoisting-Cylinders, of which the following is a specification.

My invention relates to improvements invalvesforpneumatichoisting-cylinders. The valve is so constructed as tobe self-closing by releasing the cord or lever by which it is opened. Iattain this by the mechanism illustrated in the accompanying drawings,in which Figure 1 is a front elevation. Fig. 2 is an elevation of rightside. Fig. 3 is a section on line 1 2, Fig. 2, looking from front toback. Fig. 1 is a section showing right-hand valve. Fig. 5 is a sectionon line 1 2, Fig. 2, showing casing with parts removed. Fig. 6 is asection showing left-hand valve.

Similar letters refer to similar parts throughout the several views.

The valve, briefly described, is as follows: The valve has casing (shownin Figs. 2 and 5) with two valve-chambers d and dd and having a recessin the side to receive the enlargement hit at inner end of shaft h,valve-chamber d communicating with inlet e and valvechamber ddcommunicating with outlet wand both valve-chambers d and ddcommunicating with pneumatic cylinder through chamber j and the openingat p. In valve-chamber d is placed avalve g, seated at lower end andhaving a spring f for closing. This valve controls the flow of air frominlet e to pneumatic cylinder through chamber j and the opening at p. Invalve-chamber dd is placed a Valve gg, which is slotted to receive oneend of cross-arm c, seated at lower end and havinga sprin g f forclosing. This valve controls the flow of air from pneumatic cylinderthrough the opening at p and chamber 3' to outlet as. The valves 9 andgg are independently movable and are raised by internal cross-arm c andare made self-closing by springs f forcing valves down on their seats.Gross-arm c is fixed on shaft h, which is mounted in casing so as toproject through said casing to receive an operating cross-arm a b andhaving an enlarged end hh, fitting in a recess inside of said casingbearing against said casing, so

that the pressure on inside forces the enlarged is raised by cross-arm cand the air passes throughvalve-chamber g to cylinder through chamber j.The air under pressure will flow into cylinder as long as the arm a isheld down, and when the load is hoisted to the desired height by simplyreleasing the arm a the spring f will close valve 9 and stop the airfrom entering the cylinder, and thus stop the hoisting. The load on thepiston-rod will keep the air under pressure in the cylinder and in thechamber j, Fig. 3. When the arm I), Fig. 1, is pulled down, the-valve ggis raised by cross-arm c, which will allowthe air to escape throughopening m, Fig. 3, which will cause the load on the piston-rod tobelowered, and by releasing the arm I), Fig. 1, the load may be stoppedat any desired point, because when the arm I) is released the spring f,Fig. 3, will close valve 99 and prevent the air from passing out, thuscausing the load to stop at any desired point.

While this valve is intended forair-hoists, it may be used for otherpurposes where antomatic-closing valves may be required.

What I claim as new, and desire to secure by Letters Patent, is asfollows:

In a valve the combination with a casing having two valve-chambers, onecommunicat ing with inlet 6 and one communicating with outlet w, andboth with chamber j; valveseats located between the end of theinletvalve chamber and chamber 3', and between chamber j and theoutletpassage :r, of two freely and independently movable anddisconnected spring-closing valves g and gg located within saidvalve-chambers (Z and (Id so that the pressure on inside forces theenwith said valves inside of said casing and enlarged part of shaftagainst said casing and gaging with internal cross-arm c fixed onpreventing any leaking around said shaft h.

shaft h which is mounted in said casing so JAS. L. PARKER. as to projectthrough to receive an operating \Vitnesses: cross-arm a b and having anenlarged end hh \VILLIAM MITCHELL,

inside of easing bearing against said casing JOSEPH VILCOX.

